Surface configuration of an engine



FIG. 1 is a left perspective view of a surface configuration of anengine according to my novel design;

FIG. 2 is a right perspective view of the surface configuration of anengine according to my novel design;

FIG. 3 is a front elevated perspective view of the surface configurationof an engine according to my novel design; and,

FIG. 4 is a front view of the surface configuration of an engineaccording to my novel design.

The broken lines included in the drawings depict environment and are notpart of the claimed design.

The ornamental design for a surface configuration of an engine, as shownand described.